Thomas s



(No Model.) 12S. YOUNG.

INDICATOR FOR ELEVATORS.

Patented Aug. 5, 1884.

N, PETERS. PMm-Ulhognphu. wamin xmuc UNITED ST TES PATENT 'rnonns s.route, on NEW roan,

INDICATOR FoR ELEVATORS.

SPECEFICAI'ION forming part of Letters Patent No. 303,247, dated August5, 188%.

Application filed January 31, 1884. lNo'modcl.) I

To all whom it may concern:

Be it known that I, THOMAS S. YOUNG, a citizen of the United States, anda resident of New York, in the county and State of N cw York, haveinvented certain new and useful Improvements in Indicators forElevators, of which the following is a specification, refer ence beinghad to the drawing accompanying and forming a part of the same.

My invention relates to devices for indicat ing at one or more pointsthe position and movements of an elevatorcar. Heretofore this hasusually been done by means of a rod, chain, or rope having pointersattached, and connected through some form of motion-reducing mechanismto the devices for imparting motion to the clevatorcar. For instance, adrum for imparting motion to the rod or chain has been connected by abelt to the drums carrying the hoisting-cables, or to some equivalentmoving part, the motion of the latter being thus imparted to theindicator. In practice it has been found, however, that the meansheretofore employed are open to many objections and need constantattention or adjustment in order to give good results. This is due tothe fact that in all devices for this purpose known or used the slippingof the belts and cables not being in any way compensated for, theindicating devices failed to give a correct indication of the actualposition of the car. These objections are, in the main, what I seek toavoid in my improved indicator; and this I accomplish by making apositive connection between the indicator-rod, or the device for movingthe same, and some part of the hoisting devices, the movement andposition of which at all times correspond to that of the car.

For convenienceI have illustrated my invent-ion as applied to anordinary form of hydraulic elevator, showing so much of the mechanism ofthe latter as is necessary to an under standing of the purpose andprinciple of operation of the invention.

The drawing shows in elevation the indicating mechanism and portions ofa hydraulic hoist or elevator mechanism.

A designates the cylinder of the elevatorhoisting device; B B, thepiston-rods and parts connected therewith. In the operation or use ofthe elevator these rods are moved in and out of the cylindcrA, and,'being connected by suitable gearing for multiplying their motion withthe car, it is evident that their movements and position will alwayscorrespond with that of the car.

On a proper support in the top of the elevator-shaft I mount a doubledrum, "C, the shaft 0 of which carries a gcar-whccl, D, meshing with alarger wheel, E. On the shaft of the latter, or on that of a similarwheel in case the train be extended for still further reducing themotion, is a winding-drum, or,-what is prci'e able, a worm, a, in thethreads or which is wound a cord or chain, F, passing over a pulley, b,and connected to the rod G. This rod is usually of brass, and is heldvertically cord, K, is brought through the drum G about its middle,carried around the pulley II, and made fast to a pin, (2, on thepiston-rod B. A second cord, L, is brought through the drum G, near itsedge, and connected to the pin (Z on the piston-rod. The cords arecarried around the drum C a certain number of times in oppositedirections, so that as the piston-rod B rises the drum will. be turnedin one direction; but when the piston sinks the drum will be turned inthe other direction. The rod G will in consequence be raised or lowered,and its position will always correspond to that of the pistonrod B orthe elevatorcar, which the latter moves.

I have now described a specific, and what I regard as the best, means ofcarrying out my invention. That the same may be varied or modified inmany ways is obvious. For instance, the cords K L may be connected dtrect-ly to the elevator-car, though, from the greater range of motion ofthe latter, it is evi dent that more complicated motion-reducing deviceswill in that event be required.

I have described the drum 0 as a double drum, meaning thereby a drumsufficiently wide for holding the two cords K and L on its surface, or adrum divided by a central flange or any equivalent therefor. This drummay be placed at such part of the elevatorshaft as circumstances mayrender most convenient. The use of the two cords, both positively connected to the drum and to a moving part of the hoisting mechanism,insures a correct and reliable action of the indicator.

What I claim as my invention is- 1. The indicator for elevator-cars,consisting of a drum connected with and operating the indicators, incombination with cords or bands wound in opposite directions thereon,and connected to a moving part of the hoisting mechanism, and a fixedpulley beyond thelimit of movement of the point of connection of .thecords, as and for the purpose specified.

2. The combination, with the piston-rodof an elevator-hoistingmechanism, of a fixed pulley, a double drum, cords connected to thepiston-rod and carried around the drum in oppo site directions, andindicating mechanism connected with and operated by the drum, as setforth.

3. The combination, with the piston-rod of w an elevator-hoistingmechanism, of a fixed pulley, a double drum, cords connected to a pinset in the cross-head of the piston-rod and carried around the drum inopposite directions, a train of wheels driven by the drum, and avertical movable indicating-rod connected to and operated by said train,as andfor the purpose specified.

4. The combination, with the piston-rod B, of the fixed pulley H, thedouble drum 0, the cords K L, the rod G, the train of wheels driven bythe drum, and the connection F, these parts being constructed andarranged in the manner set forth.

In testimony whereof I have hereunto set my hand this 24thday ofJanuary, 1884.

THOMAS S. YOUNG.

WVitnesses:

W. H. HARTLEY, W. FRISBY.

